Always use the latest version of your web browser (e.g. Internet Explorer, Firefox or Safari). Web browsers often provide a level of inbuilt protection such as anti-virus and anti spyware. However, you should not regard this as a substitute for your own anti-malware products, which still need to be maintained. Using an out of date browser increases the likelihood that someone might be able to exploit a weakness, so having the most up to date version and ensuring that all security patches have been applied is important.